-3.75% is the change from 667 to 642
Calculation steps:
[( 642 - 667 ) ÷ 667] x 100 = -3.75%
Formula
Percentage change = [(642 - 667) / 667] x 100
Subtract the new number by the original number
642 - 667 = -25
-25 ÷ 667 = -0.037481259370314844
-0.037481259370314844 x 100 = -3.75%